Propeller.



L. BALOG.

PROPELLER.

APPLICATION FILED OUT. 1,1908.

925,265. Patented June 15, 1909.

LOUIS BALOG, or NEW YORK, N. Y.

PROPELLER.

Specification of Letters Patent.

Patented June 1 5, 1909.

Application filed October 7, 1908. Serial No. 456,559.

To all whom it may concern.-

Be it known that I. LOUIS BALoG, of the city, county, and State of New York, have invented anew and useful Improvement in Propellers, of which the following is a full, j

clear, and exact description.

My invention relates to improvements in marine propellers. These propellers as usually made, employ a plurality ofblades which are separated in such a way that a great deal of splashing and loss of power is occasioned by rotating them in the water. I am aware, however, that blades few in number and acting continuously like a screw, have been used, but these have notbeen arranged to produce the best results.

' two bladed propeller in which the blades project from a common hub and are opposed though of similar pitch, and arranged so as to act continuously upon the water and with little commotion, in a way to get the best grip or kick on the water. In carrying out this idea, I have each blade extend more than half way around the shaft, and construct them so that each takes and leaves the water readily, while the surfaces are pitched so as to get unanimity of action and the best results. Moreover, the blades are shaped as will be presently described, so ler is reversed it acts as i that when the prope efficiently as when driven forward.

In carrying out the invention, I provide 5 each blade with channels which are op ositely arranged on the two sides, but which E are otherwise similar, and which starting from an exceedingly shallow or plane surface, gradually deepen and contract so that the blade grips the water and creates a current having an inward inclination. so that the whole force of the propeller is utilized against the water and without throwing the water to any noticeable extent from the outer edges of the propeller.

Reference is to be had to the accompanying drawings forming a part of this specification. in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is an end view of the propeller embodying my invention: Fig. 1s a side elevation of the pro )eller, and Fig. 3 is a cross section on the ine 33 of Fig. 1.

The propeller has a hub with a hole 11 therethrough to receive the propeller shaft. Projecting from the hub are two similar but opposed blades 12 and 13 which are of simil lar pitch but 0 positely disposed, so that one begins action efore the other leaves ofl' its work. This will be shown clearlyby reference to Figs. 1 and 2. It will be noticed by reference to Fig. 1 that each blade extends considerably more than half way around the shaft, and that when viewed in end elevation, the blades largely overlap as will appear from the dotted lines. The blade 12 has the beginning and ending oints a and a, while the blade 13,,has the luginning and ending points I) and 12, these being thinned so as to enter the water readily, and of course if the propeller is reversed, the beginning pointsare reversed.

similar though oppositely disposed, and a description of one answers for the other. On each blade is a channel 14 which extends from the hub to the plane surface 15, and near one blade end this channel is-relatively wide and shallow, extending from a plane surface, while at the opposite end of the blade the channel is contracted and it is much deeper. Thus on this same surface of the blade a plane 15 is'produced which is in direct contrast to the channel, that is, the wider surface of the plane 15 comes opposite i the narrower surface of the channel 14.

On the opposite side the blade is provided with the same parts 14 and 15, but they are disposed in the opposite direction, so that of the blade comes opposite the deep part of the channel on the opposed surface. When the propeller is rotated, it will be seen thatl the water enters the two channels of the two blades which are acting against the water, and is forced inward and somewhat com- 3 pressed, while the plane surfaces '15 act with a direct forward kick or push. The result is that but little water is forced outward from the periphery of the blades, but the pressure is inward and backward, and so the propeller acts with very little loss of power. This propeller can be made in any size to suit any size of vessel, and my experiments have shown that with a certain number of revolutions I get greater speed from it than from ordinary propellers which I have tried.

I- have shown the propeller in the form of a single casting, but obviously the blades might be separately made and attached to the hub without affecting the principle of the invention.

Having thus fully described my invention,

i The two blades 12 and 13 are precisely The object of my invention is to produce a the shallow end of the channel on one surface I claim as new and desire to secure by Letchanneled, the channels extending the Whole ters Patent length of the blades. 15 1. A propeller comprising a hub and over- 3. Apropeller havingopposed overlapping lapping pitched blades projecting from the blades, each blade having on opposite sides a 5 hub, the blades being opposed but of similar channel relatively wide and shallow at one and constant pitch, with oppositely widened end and relatively deep at the other, the channels onthe opposed sides of each blade. channels on the opposed surfaces being up 20 2. A propeller having opposed blades of positely arranged. screw pitch, the pitch of the two blades being 0 similar, and the blades being arranged so as v to overlap and so as to extend more than Witnesses: half Way around its hub, each of said blades AUGUST Gonro, having its surfaces partly plain and partly MAX H. KEoK.

LOUIS BALOG. 

